Valve bushing device



March 27, 1934. SPRAKER 1,952,146

VALVE BUSHING DEVICE Filed Jan. 26, 1931 f: -51 J l INVENTOR.

ATTORNEY.

i atentecl Mar. 27, 1934 VALVE BUSHING DEVICE David L. Spraker. Indianapolis 1nd assignor to Spraker Manufacturing 00., Indianapolis, Ind., acorporation of- Indiana Application- January 26, 1931, Serial No. 511,367

zcla'i'msl (01. 29-882) This invention relates to valve grinding tools or more particularly to valve bushing'removers, although certain features thereof may be em- 'ployed with equal advantage for other purposes.

.It contemplates more especially provision of a novel and'simple va'lve bushing removing device which is capable of 'readyapplication and removal' so as to enable dependable, speedy and simple valve bushing replacement.

In grinding certain types ofvalves, it'is necessary or at least customary to efiect valve bushing removal so as toafiord accurate grinding and valve cleansing. Carbon deposits form on the valve stem and the bushing therefor wears to the extent of creating a condition not conducive to accurate grinding. I

With the teachings of the instant invention the valve bushing may be instantly removed for replacement, and the valve stem cleansed so as to remove all carbon deposits thereon. Simplicity of construction and dependability of operation are necessary or at least very highly desirable with tools of this character, and for that reason known devices designed for a similar purpose have not proven entirely satisfactory.

One object of the present invention is to simplify the construction and improve the operation of devices of the character mentioned.

Another object is to provide a more simple and improved valve bushing removal tool.

Still another object is to provide a unitary valve tool which is capable of ready association and disassociation with a valve stem to effect speedy valve bushing removal.

A further object is to provide a valve bushing removal tool consisting of a single rigid device capable of ready association and disassociation for valve grinding operation.

A still further object is the provision of a valve bushing tool having a longitudinal slot in the wall thereof for ready association and disassociation with a valve stem to effect valve bushing removal.

Still a further object is to provide a unitary valve tool capable of ready association and disassociation as a complement to the valve for effecting dependable and speedy valve bushing removal.

Other objects and advantages will appear from the following description of an illustrative embodiment of'the present invention.

In the drawing:

Figure 1 is a prospective view of a device embodying features of the present invention.

Figure 2 is a view in elevation of an engine valve assembly with the bushing removal tool shown in itsinitial position of application valve stem.

Figure 3 is a view similar to Figure 2 with the bushing removal tool shown in axial association with the valve stem just prior to effecting-bushing removal.

Figure 4 is a view similar to Figure 3 withthe valve bushing removal tool depressed in connection withthe valve to effect partial valve bushing removal. I i V 1 Figu'refi is a view similar to Figure 4 with the valvebushing entirely removed and the tool shown axially aligned with the valve stem in its extreme position.

Figure 6 is a sectional view taken substantially along line VI-VI of Figure 3.

The structure selected for illustration is shown in association with an engine valve assembly comprising a crankcase frame or valve head housing 10 which is suitably bored as at 11 for the reception of the customary split valve bushings 12. An engine valve 13 has a tapered circumferential seat 14 which terminates in a frustoconical shank 15 merging with the elongated valve stem 16. The valve stem 16 has a tapered extreme follower head 17 for cooperation with the cam shaft of an engine in the customary and approved manner.

to the It will be observed that removal of the valve' 13 from the frame 10 can only be effected subsequent to the removal of the split bushings 12, and such is considered necessary to cleanse or free the valve stem 16 and its associated parts from all carbon deposits thereon. Moreover, in order to accurately grind the valve seat 14, the bushings 12 must be replaced so as to retain the stem 16 in true axial alignment during grinding operations.

Renewal of the split bushing 12 is effected, in this instance, with an elongated member 18 shaped and sizedto correspond substantially with the split bushings 12; however, the diameter thereof is slightly smaller to permit the ready displacement thereof through the frame bore 11. The elongated member 18 is provided with an axial bore or opening 19 slightly larger in diameter than the valve stem 16 to permit free relative displacement therebetween and the ready application of the tubular member 18 thereto. As shown, the member 18 terminates in a frustoconical head or extremity 20 complemental to the valve shank 15 which rests therein responsive to but axially aligned therewith. The other extremity of the tubular member 18 is slightly champered or tapered for contact with the valve bushings 12 so as to effect the displacement thereof for removal from the bore 11 responsive to pressure impacts imparted to the valve head 13.

In order to enable the ready application of the tubular member 11 to the valve stem 16 for association therewith in axial alignment, the member 18 is provided with a groove or slot 21 extending longitudinally through the wall thereof to effect communication with the interior bore 19 thereof. The slot or groove 21 is somewhat wider than the diameter of the stem 16 with ready clearance to compensate for carbon deposits thereon, thereby afiording the ready association and disassociation with the valve stem 16 for lodgment of the valve shank 15 in the correspondingly shaped member head 20 in a manner shown more specifically in Figure 3. With the member 18 in the axially aligned position in contact with the valve bushings 12 determined by the receptions of the valve shank 15 in the member extremity 20, impacts are imparted to the valve head 13 with a hammer or other suitable implement to effect the removal of the valve bushings 12. This enables the valve 13 to be removed from the bore 11 and the cleansing thereof is thus rendered easily possible to remove all carbon deposits therefrom.

Moreover, a temporary or permanent bushing may be inserted in the bore 11 with the replacement of the valve 13 so that true grinding of the valve seat 14 may be accomplished. It

is worthy of note that the bushing manipulator 18 may be used for grinding alignment of the valve 13. It is preferred, however, that a separate bushing be employed for grinding operation, and that the tubular member 13 be resorted to only for bushing removal as it serves very effectively for this purpose. As shown, the memher head 20 is interiorly dished as at 22 to correspond with the exterior contour of the valve head shank 15, and the groove or slot 21 extends throughout the length of the member 18 and. its head 20 so that it may be laterally applied to the valve stem 16 with speed and precision for axial alignment with the valve 13 to effect bushing removal.

Various changes may be made in the embodiment of the invention herein specifically described without departing from or sacrificing any of the advantages of the invention as defined in the appended claims.

I claim:

1. Means for removing valve guides, comprising a longitudinally grooved stem adapted to embrace a valve stem and provided with a valve engaging portion.

2. Means for removing valve guides comprising a longitudinally grooved stem adapted to embrace a valve stem and provided with a .valve engaging portion, said grooved stem being slightly less in diameter than the valve guide to be removed.

DAVID L. SPEAKER. 

